Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 72, Pages 19332-19340Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201804405
Keywords
aerogels; biomass; chitin; chitosan; gels
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Aerogels of polysaccharides with chelating functions can be useful as supports in many applications because of their hosting properties. This work demonstrates a facile method for the preparation of aerogels of chitosan derivative ureido-chitin, containing ureido functional groups. The nanofibrillar networks of ureido-chitin were produced by the nucleophilic addition of amine groups of chitosan with isocyanic acid prepared in situ. The presence of ureido functional groups was confirmed by FTIR, solid-state CP-MAS C-13 and N-15 NMR analyses. No crosslinking of molecular chains was observed. The maximum degree of ureido functional groups was estimated to be about 66 %. Characterization by powder XRD confirmed that the polymer chains self-assembled, with the chitin polymers oriented in a highly ordered crystalline structure. The nanofibrillar networks showed no solubility under either aqueous acidic or alkaline conditions. Bio-based hosting materials of this kind with two different hosting functional groups, ureido and amine, can potentially be utilized for a wide range of applications in aqueous medium, including filters, catalysis and biomedicine.
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